Don't expose internal superclass of Model

lib/with_model/model.rb

@@ -14,25 +14,21 @@ class Model
     def initialize name, options = {}
       validate_options!(options)
       @name = name.to_sym
-      @options = options
       @model_block = nil
       @table_block = nil
       @table_options = {}
+      @superclass = options.fetch(:superclass, ActiveRecord::Base)
     end
 
     def create
       table.create
-      @model = Class.new(superclass) do
+      @model = Class.new(@superclass) do
         extend WithModel::Methods
       end
       stubber.stub_const @model
       setup_model
     end
 
-    def superclass
-      @options.fetch(:superclass, ActiveRecord::Base)
-    end
-
     def destroy
       stubber.unstub_const
       remove_from_superclass_descendants